High-frequency-oscillation generator



March 10, 1931. H, T. FRUs 1,795,648

HIGH FREQUENCY OSCILLATION GENERATOR Original Filed April 26, V1926 82 and 34 may be used as separate conductive paths for direct current.

flhe oscillations generated in the tuned circuit may he supplied through the conductors -l and a8 and transformer 49 to a suitable load circuit.

In a practical construction the coil 38 is approximately 2 in diameter and 3 long. rlhe base, upon which a standard socket for vacuum tubes is mounted, is approximately 2 i; 2.

By placing a coil cf the above dimensions between two of such bases arranged back to back, so that the vacuum tubes extend in opposite directions from the respective bases, the terminals on the bases may be connected to the terminals of and to taps on the coil. ln this manner the length of the connecting leads is reduced to a. minimum and a compact structure is provided. Moreover, the tendency of the system to produce undesired or parasitic oscillations is reduced to a minimum and the operation of the system, to generate oscillations of the frequency determined by the tuned circuit 37-38, is stabilized.

What is claimed is:

l. ln a space discharge oscillator, a pair of three-electrode space discharge devices in push-pull relation, a resonant circuit connected to the electrodes of said devices for determining the frequency ofthe oscillations, said circuit including an inductance coil comprising a hollow tube conductor and a plurality of insulated conductors positioned within said tube, said conductors being adapted to function as a single inductance `for alternating currents, but as a plurality of separate paths through Which direct current may be supplied to said devices. y

2. In a space discharge oscillator, a pair of three-electrode space discharge devices Vin push-pull relation, a resonant circuit for determining the frequency of the oscillations comprising an inductance and a variable condenser, said inductance comprising a plurality of insulated conductors enclosed in a conducting envelope, each conducting element providing a separate path for direct currents While said elements constitute a single 'inductance for alternating current.

3. An electric oscillator comprising an electric discharge device and a tuned circuit for determining the frequency of the oscillations including a capacity element and an inductance element, said inductance element comprising a plurality of insulated conducting element-s and a conducting envelope element enclosing said insulated conducting elements, the conducting elements each providing a separate path for direct currents and together constituting a single inductive path for alternating currents.

4. An electric oscillator comprising an electric discharge device having an anode, a cathode and a control element, a tuned circuit for determining the frequency of the oscillations and including a capacity element and an inductance element, said inductance element comprising a plurality of insulated conducting elements and a conducting envelope element enclosing said insulated conducting elements, all of said conducting elements cc' ating a single inductive path for al- .g currents, means for supplying a direct current potential to said contr-ol element through one of said insulated conducting elements, and means for supplying space current between said anode and cathode through another of said insulated conducting lements.

5. ln combination, an electric discharge cevice, a source of direct current therefor, inductance device comprising an envelope conductor and another conductor mounted within said envelope conductor and insulated therefrom for direct currents, means for connecting said conductors in parallel for alterhating currents, and means for supplying direct current from said source to said device through only one of said conductors.

wi combination, two electric discharge devices each having a cathode, an anode and a control element, an inductance element coming a conducting envelope and a plurality "sulated conductors enclosed in said conenvelope, a circuit interconnecting the anode and cathode of one of said devices, said circ it including one of said insulating .ctors and asource of direct current, a nd circuit including another of said insulaductors interconnecting the cortrol electrode and cathode of the other of said devices, and capacity means connecting aid insulated conductors with said conductenvelope.

l. ln combination, an electric discharge device having an anode and a cathode, an inductance clement comprising an envelope conductor and another conductor mounted Within said envelope conductor and insulated therefrom, means having a lovv impedance to alternating currents and substantially infinite impedance to direct currents for connecting together corresponding terminals of said envelope conductor and said other conductor, means for setting up a direct current lloiv through one of said conductors, and connections from said one conductor to said anode and cathode.

ln Witness whereof, l hereunto subscribe my name this 2nd day of April, 1928.

HARALD T. FRHS. 

